本文分析了1987～1995年手术治疗45例胸廓出口综合症病人，经手术证实引起胸廓出口综合症之主要病因中除通常所述的斜角肌病变、预肋、胸小肌出点处病变和肋锁间隙病变外。还有一种病因，即胸膜上筋膜（Sibson筋膜）卡压臂丛下干而导致胸廓出口综合症。其中7列行手术探查肘，未发现其他卡压因素，仅发现臂丛下手表面覆盖一层薄的筋膜，遂对此筋膜进行了松解，术后症状明显缓解，因此认为此膜系卡压因素。 This article analyzes the surgical treatment of 45 cases of thoracic outlet syndrome patients from 1987 to 1995, confirmed by surgery in the main causes of thoracic outlet syndrome in addition to the commonly described in the myenteric myopathy, pre-rib, pectoralis minor muscle lesions and Rib lock space outside the disease. There is also a cause, namely the fascia (Sibson fascia) compression under the brachial plexus resulting in thoracic outlet syndrome. Among them, 7 patients underwent surgical exploration of the elbow. No other compression factors were found. Only a thin fascia was found on the surface of the brachial plexus. The fascia was loosened and the postoperative symptoms were relieved. Therefore, Pressure factors.